Strap wrench



Oct. 21 1924.

G. BRYAR STRAP WRENCH Original Filed Dec. 15. 192] Patented Oct. 21,1924.

UNITED STATES PATENT OFFICE.

GEORGE BRYAR, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF THREE-FOURTHS T0EDWIN W. FORD AND ONE-FOURTH TO JAMES C. FLANNERY, BOTH OF BOSTON,

STRAP WRENCH.

Application filed December 15, 1921, Serial No. 522,454. Renewed March21, 1924.

To all whom it may concern:

Be it known that I, GEORGE BRYAR, a citizen of the United States,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented certain new and useful Improvements in Strap Wrenches, ofwhich the following is a specification.

The object of this invention is the con struction of a wrench forscrewing up piping having finished surfaces, either brass or plated,which shall be capable of adjustment to such piping, which will not slipbut will tightly grip the same, and at the same time will not injure thesurfaces to which it is applied.

To this end I provide a handle having a head to which an end of thestrap is permanently attached, and a shank along which the other end ofthe strap can be adjustably secured, my preferable means for suchadjustment consist ng in threading the shank and mounting thereon aninternally threaded collar to which the end of the strap is attached. Ialso provide means for keeping the threaded collar from turning on theshank relative to the head, in order to maintain the head and collaralways in proper relationship. I further improve the wrench by formingits head with a rounded nose by means of which the strap is made toenclose nearly the entire periphery of the piping being acted upon, andthereby to ensure a more perfect grip thereon.

The drawing forming part of this specification is a side view of a pipewrench embodying my improvements, the piping being shown in section.

The handle 1 has rigidly projecting therefrom a shank 2 threaded forpractically its entire length, and having a head 3 ro tatably mountedupon its outer end. From this head projects a lip 6 rounded at its endand having its surface 7 slightly inclined relative to the shank. Uponthis surface is fastened an end of a strap 9 by any suitable attachingdevice, as a screw 10, the strap itself being preferably of ribbonsteel.

Mounted on the shank 2 and internally threaded to coact therewith, is acollar 11 having a finger 12 projecting therefrom, the edge of thisfinger being serrated, as at 13.

The collar 11 and the head 3 are made to turn on the shank 2 in unisonby a slender rod 1 1 rigid with one thereof but slidable in an eye 15 ofthe other member. Thus arranged, when the shank is revolved it turnsequally in both the head and collar.

The end of the strap 9 not attached to the head 3 is provided with aslotted plate 16 adapted to be engaged with the serrations of the finger12, either close to the collar or farther therefrom, as the best actionof the wrench demands.

In using this wrench, the plate 16 is removed from its engagement withthe fin ger 12 to permit the strap 9 to be passed about the piping to beturned. Then the handle 1 is rotated until the collar 11 is propelledthereby to a point at which the finger 12 readily engages the slottedplate 16, with the lip 6 pressing the adjacent section of the straptightly against the surface of the pipe, as 19. If the pipe iscomparatively small in diameter, the plate 16 is engaged with aserration close to the collar, but if larger, the plate is put intocontrol of a serration farther from the collar.

The handle 1 is again turned until the strap is put under tension, andthen the handle is swung in a direction to maintain the nose or lip 6 inadvance of the body of the strap. This causes the strap to tighten up onthe piping until the grip becomes sufficient to force the pipe to turnwith the handle. When the handle is moved in the opposite direction, thestrap releases its hold said shank, and said collar having an eyeslidable on said rod.

In testimony that I claim the foregoing invention, I have hereunto setmy hand this 10th day of December, 1921.

GEORGE BRYAR.

